public final class IndexedLookupExpression extends Expression
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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IndexedLookupExpression(VariableReference base,
Expression lookup,
AtomicComparer comparer)
Constructor
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| Modifier and Type | Method and Description |
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int |
computeCardinality()
Get the static cardinality of this expression
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int |
computeDependencies()
Determine which aspects of the context the expression depends on.
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int |
computeSpecialProperties()
Get the static properties of this expression (other than its type).
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Expression |
copy()
Copy an expression.
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boolean |
effectiveBooleanValue(XPathContext context)
Get the effective boolean value of the expression.
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boolean |
equals(Object other)
Is this expression the same as another expression?
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Item |
evaluateItem(XPathContext context)
Evaluate an expression as a single item.
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void |
explain(ExpressionPresenter destination)
Diagnostic print of expression structure.
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AtomicComparer |
getAtomicComparer()
Get the atomic comparer used
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VariableReference |
getBaseExpression()
Get the underlying expression
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ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the IndexedLookup expression
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ItemType |
getItemType(TypeHierarchy th)
Get the data type of the items returned
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Expression |
getLookup()
Get the lookup expression
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Expression |
getUseExpression()
Get the expression that computes the key
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int |
hashCode()
get HashCode for comparing two expressions
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Iterator<Expression> |
iterateSubExpressions()
Get the immediate subexpressions of this expression
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Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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Expression |
promote(PromotionOffer offer,
Expression parent)
Promote this expression if possible
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boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression
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Expression |
simplify(ExpressionVisitor visitor)
Simplify an expression
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Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression
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addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeStaticProperties, doPromotion, dynamicError, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getExpressionName, getHostLanguage, getImplementationMethod, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, iterateSubExpressionInfo, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, toString, typeErrorpublic IndexedLookupExpression(VariableReference base, Expression lookup, AtomicComparer comparer)
base - A sequence expression denoting the sequence to be searchedlookup - An expression defining value to be soughtpublic ItemType getItemType(TypeHierarchy th)
getItemType in class Expressionth - the type hierarchy cachepublic VariableReference getBaseExpression()
public Expression getLookup()
public Expression getUseExpression()
public AtomicComparer getAtomicComparer()
public Expression simplify(ExpressionVisitor visitor) throws XPathException
simplify in class Expressionvisitor - an expression visitorXPathException - if an error is discovered during expression
rewritingpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType)
typeCheck in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEpublic Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType)
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize in class Expressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEpublic Expression copy()
copy in class Expressionpublic Expression promote(PromotionOffer offer, Expression parent) throws XPathException
promote in class Expressionoffer - details of the promotion that is possibleparent - XPathException - if any error is detectedpublic Iterator<Expression> iterateSubExpressions()
iterateSubExpressions in class Expressionpublic boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression in class Expressionoriginal - the original subexpressionreplacement - the replacement subexpressionpublic int computeCardinality()
computeCardinality in class Expressionpublic int computeSpecialProperties()
computeSpecialProperties in class Expressionpublic boolean equals(Object other)
public int hashCode()
public boolean effectiveBooleanValue(XPathContext context) throws XPathException
ExpressioneffectiveBooleanValue in class Expressioncontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic Item evaluateItem(XPathContext context) throws XPathException
ExpressionevaluateItem in class Expressioncontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic int computeDependencies()
computeDependencies in class Expressionpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class Expressionpublic void explain(ExpressionPresenter destination)
explain in class Expressiondestination - the expression presenter used to display the structureCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.